JPH0451023A - Production of liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent the shifting of two sheets of substrates during production process by tentatively fixing two sheets of glass substrates stuck by a thermosetting adhesive by using a UV curing adhesive. CONSTITUTION:The UV curing adhesive 3 is applied at least at 2 points by a dispenser, etc., on the glass substrate 1 printed with the termosetting adhesive 2 for sealing. The adhesive is applied not near the thermosetting adhesive 2 but at the corners of the glass substrate 1 as far as possible t this time. another glass substrate 1' is thereafter stuck to this substrate and the glass substrates 1, 1' are irradiated with UV rays by a UV spot irradiating device 4 right after the end of the registration of the transparent electrode patterns formed on the respective glass substrates 1, 1', by which two sheets of the glass substrates 1, 1' are tentatively fixed. The thermosetting ahdesive is then cured by compression bonding under hating. The misregistration is prevented in this way and the registration is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a liquid crystal display device used for display parts of personal computers, word processors, calculators, watches, and the like.

[Conventional technology]

The conventional method for manufacturing a liquid crystal display device is to bond two glass substrates 1.1' with a thermosetting adhesive 2 as shown in FIG. 5, and then press the glass substrates together with a certain amount of pressure. The transparent electrode patterns were aligned and then heated and pressed to harden the adhesive.

[Problem to be solved by the invention]

However, in such a conventional method, the glass substrates may become misaligned with each other before the adhesive hardens after the transparent electrode patterns formed on the glass substrates are misaligned. Further, when aligning, a very large force is required due to the viscosity of the adhesive, making it difficult to align.

Therefore, in order to solve these conventional problems, the present invention
It is an object of the present invention to provide a method that can easily prevent misalignment and perform alignment.

[Means to solve problems]

In order to solve the above problems, the present invention applies a thermosetting adhesive in a predetermined shape to at least one of two glass substrates that sandwich a liquid crystal layer, and then stacks the two glass substrates to manufacture a cell. Sometimes, a UV curing adhesive is applied to a portion of the glass substrate that does not sandwich the liquid crystal layer, and the glass substrate is overlapped with the other glass substrate, and the transparent electrode patterns formed on each glass substrate are aligned. After that, the U
The method is characterized in that after the V-curing adhesive is cured to temporarily fix the two glass substrates, the thermosetting adhesive is cured.

〔Example〕

Example 1 An example of the present invention is shown in FIGS. 1 and 2. In FIG. 1, a UV curing adhesive is applied to at least two places on a glass substrate 1 on which a thermosetting adhesive 2 for sealing is printed using a dispenser or the like. At that time, it is better to apply it to the corners of the glass substrate as much as possible, rather than near the thermosetting adhesive. Thereafter, the other glass substrate 1' is bonded together, and immediately after aligning the transparent electrode patterns formed on each glass substrate, ultraviolet rays are irradiated by the ultraviolet spot irradiation device W4 as shown in FIG. Temporarily fix the glass substrates l and l'. Thereafter, the thermosetting adhesive was cured by heat compression bonding. The crimping pressure at this time may be about one-tenth of that in the case of not temporarily fixing. In addition, by temporarily fixing, there was no misalignment of the two substrates during the manufacturing process, and a high-quality liquid crystal display device could be manufactured.

Example 2 In FIG. 3, two glass substrates 1 and 1' are bonded together in the same way as in Example 1, and after the alignment of the transparent electrode patterns formed on each glass substrate is completed, UV After temporarily fixing the two glass substrates 1 and 1' by irradiating the cured adhesive 3 with ultraviolet rays in the thickness direction of the glass substrate 1゜1゛ using the ultraviolet ray spot irradiation device 4, the two glass substrates 1 and 1' are temporarily fixed, and then the thermosetting adhesive is bonded with heat and pressure. hardened. As in Example 1, a high-quality liquid crystal display device could be manufactured without any misalignment of the two substrates during the manufacturing process due to temporary fixation.

Practical example 3 As shown in Figure 4, glass substrate 1 and the other glass substrate 1
A transparent electrode pattern is formed so that when the two glass substrates 1. The two glass substrates 1 were bonded together with a difference of 1" from each other. A UV curing adhesive 3 was applied to the stepped portion of the glass substrate 1 and the other glass substrate 1', and the two glass substrates 1 were irradiated with ultraviolet light using an ultraviolet spot irradiation device 4. After temporarily fixing and 1', the thermosetting adhesive was cured by heat-pressing.This method has the same effect as in Example 1, but has the additional advantage that the UV-curing adhesive does not sag.

〔Effect of the invention〕

As explained above, the present invention temporarily fixes two glass substrates pasted with a thermosetting adhesive using a UV curable adhesive, thereby eliminating the problem of 2nd generation during the manufacturing process, which was a problem in the past. We were able to create a liquid crystal display device with no misalignment of the substrates, and were able to obtain a high-definition, uniform display.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of the present invention, in which a UV-curable adhesive is applied to a glass substrate. FIG. 2 is a diagram similarly showing the first embodiment of the present invention, in which ultraviolet rays are irradiated with an ultraviolet spot irradiation device. FIG. 3 is a diagram showing a second embodiment of the present invention, in which a UV curing adhesive is applied laterally to a glass substrate and UV rays are irradiated. FIG. 4 is a diagram showing a third embodiment of the present invention, in which a UV curing adhesive is applied to a stepped portion of a glass substrate and ultraviolet rays are irradiated. FIG. 5 is a diagram showing a conventional method, in which two glass substrates are bonded together. 1... Glass substrate 1'... Glass substrate 2... Thermosetting adhesive 3... UV curing adhesive 4... Ultraviolet spot irradiation device Fig. 2

Claims (1)

[Claims] In a method of manufacturing a liquid crystal display device, a thermosetting adhesive is applied in a predetermined shape to at least one of two glass substrates sandwiching a liquid crystal layer, and the two glass substrates are stacked to form a cell. After applying a UV curing adhesive to the portion of the glass substrate that does not sandwich the liquid crystal layer, overlapping it with the other glass substrate, and aligning the transparent electrode patterns formed on each of the glass substrates, A method for manufacturing a liquid crystal display device, comprising curing the thermosetting adhesive after curing the UV curing adhesive.